Chlorosis is the loss of chlorophyll leading to yellowing in leaves. This symptom is caused by the deficiency of elements like :-

Options

A. S, Fe, Ca, Cu
B. Mn, Mo, B, Cl
C. Fe, Mg, Mo, N
D. Ca, Mg, Cu

Answer

**Step-by-Step Solution:**

1. **Understanding Chlorosis**: Chlorosis is defined as the yellowing of leaves due to the loss of chlorophyll. This condition affects the plant's ability to perform photosynthesis effectively.

2. **Identifying the Cause**: The primary cause of chlorosis is the deficiency of essential nutrients that are critical for chlorophyll production. When these nutrients are lacking, chlorophyll synthesis is impaired, leading to yellowing of the leaves.

3. **Essential Nutrients**: Several nutrients are vital for the synthesis of chlorophyll. The key elements that can lead to chlorosis when deficient include:
- **Nitrogen**: An essential component of chlorophyll.
- **Magnesium**: A central atom in the chlorophyll molecule.
- **Iron**: Crucial for the synthesis of chlorophyll and involved in various enzymatic reactions.
- **Molybdenum**: Plays a role in nitrogen metabolism.

4. **Conclusion**: The deficiency of elements like nitrogen, magnesium, iron, and molybdenum can lead to chlorosis in plants. Therefore, these elements are essential for maintaining healthy chlorophyll levels and preventing yellowing of leaves.

5. **Correct Answer**: Based on the analysis, the elements that cause chlorosis due to their deficiency are nitrogen, magnesium, iron, and molybdenum.